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PETG - Adhesion

Discussion in 'Printing Filament' started by Stephen Capistron, Apr 30, 2015.

  1. Stephen Capistron

    Stephen Capistron Active Member

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    I have been trying to print something out of PETG that is about 50mm wide and 100mm long with a fairly high infill (25%). The way the parts are designed I intended on taking advantage of the smooth glass surface such that I would have a perfectly flat side on the part. At least as perfectly flat as plastic can get.

    I had done 80C with hairspray and the part cooling fan on and got a little bit of lift up at the edges. Changed the design a bit so there was some stress relief in the part to allow for a little more shrinkage and this improved things, but still a little lifting.

    So I turned things up to 11. 90C bed, painter's tape cleaned with acetone, with a dose of hairspray. I spent a few minutes trying to get the thing off this morning with no luck. Going to 11 may have not been a good idea, but I really have not spent that much effort trying to get it off. I will flood the bed with water to break down the tape and hairspray. Possibly add a little heat too.

    Next time maybe I'll skip the painter's tape.
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    That's 9, maybe 10. 11 would be 110C bed. :)
    Unlike ABS (so far, in my cases, YMMV, etc.) PET responds to the heated bed in a non-linear fashion.
    Above a certain point it gets worse IMHO.
     
  3. Stephen Capistron

    Stephen Capistron Active Member

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    I could see going too far past the Tg being a bad thing now that I think about it a bit more.
     
  4. Stephen Capistron

    Stephen Capistron Active Member

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    A little water and heating it back up to 80-85C did the trick.
     
  5. Printed Solid

    Printed Solid Volunteer Admin
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    I'm pretty sure the surface of the robo is actually way lower than what the thermistor indicates. Go hotter if needed.
     
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  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  7. Wikid

    Wikid Member

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    I print the eSun PETG at 80c on the bed with hairspray and holds fine for me. I also run the hotend at 245 for the first layer then drop to 240. I have printed some fairly skinny parts they held without issue. I tried to print with the bed at 70c some parts did ok but going lower it would just pop off part way though the print.

    Wikid
     

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